#include <iostream>
#include <cstdio>
#include <string>
#include <pthread.h>
#include <unistd.h>

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;

void *active(void *args)
{
    std::string name = static_cast<const char *>(args);
    while(true)
    {
        pthread_mutex_lock(&mutex);
        //等待时会先自动释放锁再去等待
        //被唤醒时会自动拥有锁
        pthread_cond_wait(&cond, &mutex);
        printf("%s is active\n", name.c_str());
        pthread_mutex_unlock(&mutex);
    }
}

int main()
{
    pthread_t tid1, tid2, tid3;
    pthread_create(&tid1, nullptr, active, (void *)"thread-1");
    pthread_create(&tid2, nullptr, active, (void *)"thread-1");
    pthread_create(&tid3, nullptr, active, (void *)"thread-1");

    sleep(1);
    printf("Main thread ctrl begin...\n");
    while(true)
    {
        printf("main wakeup thread...\n");
        pthread_cond_signal(&cond);
        // pthread_cond_broadcast(&cond);
        sleep(1);
    }

    pthread_join(tid1, nullptr);
    pthread_join(tid2, nullptr);
    pthread_join(tid3, nullptr);

    return 0;
}
